List of top Chemistry Questions

Conversion of X to Y is an example of
Conversion of X to Y is an example of
Which of the following is not an example of allylic halide?
Which complex among the following is most paramagnetic?
Which of the following solutions is used in the styptic action which prevents bleeding of blood?
‘A’ is a protecting colloid. The following data is obtained for preventing the coagulation of 10 mL of gold sol to which 1 mL of 10% NaCl is added. What is the gold number of ‘A’?
‘A’ is a protecting colloid.
The basicity of H$_3$PO$_2$, H$_3$PO$_3$, H$_3$PO$_4$ respectively is
Which of the following reactions of KMnO$_4$ occurs in acidic medium?
Consider the cell reaction, at 300 K.
A\(^+ (aq)\) + B\(^3+\) (aq) \(\rightleftharpoons\) A\(^2+\) (aq) + B (g) Its \(E^\circ\) is 1.0 V. The \(\Delta_r H^\circ\) of the reaction is -163 kJ mol\(^{-1}\). What is \(\Delta_r S^\circ\) (in J K\(^{-1}\) mol\(^{-1}\)) of the reaction?
(F = 96500 C mol\(^{-1}\))
In water, which of the following gases has the highest Henry’s law constant at 293 K?
The rate constant of a first order reaction was doubled when the temperature was increased from 300 to 310 K. What is its approximate activation energy (in kJ mol\(^{-1}\))?
(R = 8.3 J mol\(^{-1}\) K\(^{-1}\), \(\log 2 = 0.3\))
What are X and Y respectively in the following reaction sequence?
X and Y respectively
Match the pollutant in List I with its maximum permissible limit in drinking water given in List II.

maximum permissible limit in drinking water

Which one of the following alkali metals is the weakest reducing agent as per their \( E^\circ \) values?
A vessel of volume \( V \) L contains an ideal gas at \( T(K) \). The vessel is partitioned into two equal parts. The volume (in L) and temperature (in K) in each part is respectively:
Observe the following reaction: \[ ABO_3 (s) \xrightarrow{1000 K} AO (s) + BO_2 (g) \] The enthalpy change \( \Delta H \) for this reaction is \( x \) kJ mol\(^{-1} \). What is its \( \Delta U \) (in kJ mol\(^{-1}\)) at the same temperature? (R = 8.3 \text{ J mol}^{-1} \text{ K}^{-1})
100 mL of 0.1 M \( Fe^{2+} \) solution was titrated with \( \frac{1}{60} \) M \( Cr_2O_7^{2-} \) solution in acid medium. What is the volume (in L) of \( Cr_2O_7^{2-} \) solution consumed?
The shape of the colourless neutral gas formed on thermal decomposition of ammonium nitrate is:
The number of lone pairs of electrons on the central atom of \( BrF_5 \), \( XeO_3 \), \( SO_3 \) respectively are:
An alcohol \( X \) (\( C_4H_{10}O \)) does not give turbidity with conc. HCl and ZnCl\(_2\) at room temperature. \( X \) on reaction with reagent \( Y \) gives \( Z \). What are \( X \), \( Y \), and \( Z \) respectively?
Which of the following sets of reagents convert toluene to benzaldehyde? \includegraphics[]{158.png}
What are X and Y respectively in the following reactions? \includegraphics[]{159.png}
IUPAC names of the following compounds A and B are: \includegraphics[]{160.png}
Cobalt (III) chloride forms a green-colored complex ‘X’ with NH\(_3\). Number of moles of AgCl formed when excess AgNO\(_3\) solution is added to 100 mL of 1M solution of ‘X’ is:
What are Y and Z respectively in the following reaction sequence? \begin{center} \includegraphics[]{155.png} \end{center}
Given below are two statements: I. Cytosine and guanine are formed in equal quantities in DNA hydrolysis.
II. Adenine and uracil are formed in equal quantities in RNA hydrolysis. The correct answer is: